Might want to try reading my Duramax with a cheapie scan tool, aint gonna happen. Might want to read here about obdII coverage. Save you the trouble, quoted form the above link.........Since the OBDII standard covers only emissions-related powertrain systems and sensors, there is a lot information you won't be able to see with a generic OBDII scan tool.......I have a generic scanner as well as the one form the above link & it will not read any powertrain codes on our 99 Exploder or the 02 Duramax. Not trying to argue with you, just trying to help.